1. Stein, D. (ed.) (1989), Lectures in the Sciences of Complexity, vol. 1, Santa Fe Institute Studies in the Sciences of Complexity, Redwood City, CA: Addison-Wesley
2. Arrow, K. J., and F. Hahn (1971), General Competitive Analysis, Edinburgh: Oliver & Boyd
3. David, P. A., and W. C. Sanderson (1986), ‘Rudimentary contraceptive methods and the American transition to marital fertility control’, in S. L. Engerman and R. E. Gallman (eds.), Long-Term Factors in American Economic Growth, Chicago: University of Chicago Press (for the National Bureau of Economic Research), 307–90
4. The Fable of the Keys
5. Rational cooperation in the finitely repeated prisoners' dilemma